1997 Johnson Evinrude "EU" 9.9 thru 30 2-Cylinder Service Repair Manual, P/N 507263, Page 149Get this manual
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9 Measure the piston in two locations, 90 apart from each other, Va in(3 mm) above the bottom of the piston skirt10 The difference between the two measurements is the out-ofroundness and must be no mo